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Results 351 - 400 of 992
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Dufort C G - - 2001
Changes in the heart rates of lobsters (Homarus americanus) were used as an indicator that the animals were capable of sensing a reduction in the salinity of the ambient seawater. The typical response to a gradual (1 to 2 ppt/min) reduction in salinity consisted of a rapid increase in heart ...
Van Gelder B M - - 2001
A 63-year-old man with chronic atrial fibrillation and heart failure had a biventricular pacing system implanted. The pulse generator was a standard DDDR pacemaker, using the atrial channel for the right ventricular lead and the ventricular channel for the left ventricular lead. During final adjustment of the pacing parameters, a ...
Barold S S - - 2001
This report describes the development of an unusual pacemaker tachycardia in a patient with a conventional dual chamber pacemaker used for biventricular pacing in the VVIR mode. The atrial channel was connected to the left ventricle and the ventricular channel to the right ventricle. The tachycardia was sustained by sensing ...
Arroyo Espliguero R - - 2001
This article presents a case of displacement of the ventricular electrode of a DDD pacemaker occurring 3 years after implantation following a session of respiratory therapy. The incident provoked the loss of the ventricular pacing and left pectoral stimulation. The different techniques for achieving airway patency that can be used ...
Toda N - - 2001
Doppler index is the sum of isovolumetric contraction time and isovolumetric relaxation time divided by ejection time and has clinical value as an index of combined systolic and diastolic myocardial performance. This crossover study compared the Doppler index and atrial natriuretic hormone (atrial natriuretic peptide) [ANP] between optimal (AV) delay ...
Beaufort-Krol G C - - 2001
At the age of 4 years, a total cavopulmonary connection was performed in a boy with a complex congenital heart defect. On addition, a DDDR pacemaker was implanted for sick sinus syndrome. Atrial and ventricular leads were epicardially placed at the left atrium and left ventricle. At the age of ...
Arnar D O - - 2001
BACKGROUND: Transvenous pacemaker catheters may be placed unintentionally into the left ventricle. This can lead to thromboembolic complications. METHODS AND RESULTS: We report two cases where pacemaker catheters placed unintentionally in the left ventricle via a patent foramen ovale resulted in cerebrovascular accidents. The malpositioned pacemaker catheters were demonstrated by ...
Forterre S - - 2001
A 13-year-old male neutered domestic shorthaired cat had repeated syncopal episodes over a 6 month period, which had variable duration and continued to increase in frequency. Intermittent ventricular asystole, due to complete heart block, and hyperthyroidism were documented. As the syncopal episodes did not respond to a 4-week medical treatment ...
Vanholder R - - 2001
The uremic syndrome is a complex mixture of organ dysfunctions, which is attributed to the retention of a myriad of compounds that under normal condition are excreted by the healthy kidneys (uremic toxins). In the area of identification and characterization of uremic toxins and in the knowledge of their pathophysiologic ...
Schwaitzberg S D - - 2001
Trocar insertion during laparoscopic preperitoneal hernia repair (TEP) can be troublesome because the space into which the trocars are inserted is smaller than that available for transabdominal approaches. Insertion of the trocars directly into the balloon used to dissect the preperitoneal space can facilitate this process. The insertion of a ...
Searleman A - - 2001
Left-handers often have had to contend with pressure to switch their preferred writing hand and shift attempt reports are common, especially among older adult left-handers. Three groups of left-handers can be defined by combining two variables, writing hand side and the report of a rightward hand preference shift attempt. The ...
Salzer W - - 2001
PURPOSE: Intrathecal methotrexate (MTX) achieves high concentrations in the cerebrospinal fluid (CSF) following intralumbar administration. However, peak ventricular CSF MTX concentrations are highly variable and are < 10% of those achieved with intraventricular dosing. The objectives of this study were to evaluate the effect of intralumbar and intravenous probenecid on ...
Pachón J C - - 2001
The QRS widening by ventricular conventional pacing impairs the systolic and diastolic functions and increases mitral regurgitation. The aim of this study was to compare conventional pacing to an alternative stimulation mode with a narrower QRS using two leads in the RV. Thirty-nine (25 men, 14 women; mean age 60.1 ...
O'Cochlain B - - 2001
Pacemaker dependent patients exhibit interventricular conduction delay due to right ventricular lead placement. The addition of a transvenous coronary sinus lead for biventricular pacing has been shown to be effective. Venous stenosis and thrombosis postpacemaker implantation can occur in up to 35% of patients. This report describes a patient with ...
Seeck M - - 2001
This report describes a patient with complex partial seizures arising from the right temporal lobe who developed symptomatic sinus arrest following the end of his seizure activity. A ventricular pacemaker was implanted and was documented to function appropriately, preventing development of bradycardia associated symptoms during subsequent seizures. Possibly relevant cerebral ...
Plummer C J - - 2001
AIMS: To compare pacemaker telemetry with simultaneous Holter recordings in the diagnosis of atrial fibrillation and to evaluate the STOP-AF study telemetry criteria for the presence of atrial fibrillation. METHODS AND RESULTS: 18 consecutive patients enrolled in the STOP-AF study had simultaneous 24 h Holter recordings and down-loaded pacemaker telemetry. ...
Yang J - - 2001
OBJECTIVES: To assess the preliminary clinical results of implantation of dual chamber pacemaker defibrillator and to evaluate the safety and effectiveness of placement of endocardial leads in the axillary vein. METHODS: Seven patients with ventricular tachycardia and/or ventricular fibrillation (VT/VF), associated with bradyanhythmia received implantation of a dual chamber pacemaker ...
Heath M - - 2001
The model of apraxia proposed by Roy (1996) states that three patterns of apraxia should be observed across pantomime and imitation conditions. In the present analysis the frequency and severity of each pattern of apraxia were examined in a consecutive sample of left-(LHD) and right-hemisphere-damaged (RHD) patients during the production ...
Nayak A K - - 2001
BACKGROUND: Minute ventilation responsive rate adaptive pacemaker improves exercise performance in the patients with chronotropic insufficiency. The usual complications of these pacemakers are related to pacemaker implantation, rather than to the rate adaptive function. CASE REPORT: We report a patient with mitral stenosis and atrial fibrillation with a VVIR pacemaker, ...
Tang J B - - 2001
Immediate active mobilization of repaired tendons is thought to be the most effective way to restore function of injured flexor tendons. Sixty human flexor digitorum profundus tendons were used to evaluate techniques for active tendon motion. The tendons were divided equally into six groups, and each group was assigned to ...
Harrigan R A - - 2001
Atrioventricular (AV) dissociation is an electrocardiographic syndrome; a descriptive term for a variety of conditions of abnormal cardiac conduction which all feature independent function of the atria and ventricles. AV dissociation can be subclassified as AV dissociation by default (an independent ventricular pacemaker responds to slowing of the dominant atrial ...
Arthur W - - 2001
A patient with congestive heart failure and an ICD had undergone atrioventricular nodal ablation and optimization of heart failure medical therapy. Intracardiac T wave sensing by the ICD drew attention to the new development of asymptomatic hyperkalemia. Surface ECG features of hyperkalemia were not readily identified due to pacemaker dependence.
Yu H Y - - 2001
BACKGROUND: Human oscillator is observed in and outside the nervous system. Cardiac rhythm is generated by heart itself but can be modulated by brain. Using the technique of transcranial magnetic stimulation (TMS) and resetting index, we studied if single-pulse TMS could reset the cardiac rhythm and help differentiate oscillator of ...
Lai C L - - 2001
A 23-year-old woman with craniofacial hyperhidrosis underwent bilateral thoracoscopic T2-sympathectomy. Marked sinus bradycardia with a mean heart rate of 49 beats/min by Holter ECG monitoring occurred after the procedure and persisted for > 2 years. Normal sinus node function was found by an invasive electrophysiological study and unopposed vagotonia after ...
Glikson M - - 2001
Pacing is a field of rapid clinical progress and technologic advances. Clinical progress in the 1990s included the refinement of indications for pacing as well as the use of pacemakers for new, nonbradycardiac indications, such as the treatment of cardiomyopathies and CHF and the prevention of atrial fibrillation. Important published ...
Holger J S - - 2001
Determining electrical capture when using an external cardiac pacemaker is often difficult and confusing, especially when the resulting clinical signs of an effective blood pressure and pulse are inadequate or nondetectable. The objective of this study was to determine the efficacy of using 2-dimensional ultrasound (US) in determining the presence ...
Bengtsson J - - 2001
METHODS: Fourteen children aged 4-15 months were studied after corrective cardiac surgery. Heart rate was increased by 20% with an external pacemaker. Cardiac output (CO) was measured with thermodilution. Oxygen saturation was measured in systemic artery (SaO2), central vein (ScvcO2) and pulmonary artery (SvO2). Inspiratory to endtidal oxygen difference (FI-ETO2) ...
Barold S S - - 2001
Ventriculoatrial (VA) synchrony during dual chamber pacing can occur in any patient who has the ability to sustain repeated retrograde conduction. If the retrograde P wave is sensed, the result will be an endless loop tachycardia or repetitive reentrant VA synchrony. VA synchrony can also occur when a dual chamber ...
Ananthasubramaniam K - - 2001
An 84-year-old man with a history of permanent pacemaker placement had a preoperative cardiac evaluation for prostate cancer surgery. The patient was asymptomatic, and the results of a physical examination were consistent with a right bundle branch block, which was confirmed by electro-cardiogram as his paced rhythm. A chest radiograph ...
Chamberlain M C - - 2001
Leptomeningeal metastases (LMs) are common metastatic complications, occurring in at least 5% of patients with disseminated cancer. Cerebrospinal fluid (CSF) cytology remains the standard for diagnosis and assessment of treatment response, but may be inadequate. Our objective was to compare ventricular and lumbar CSF cytology in patients who had cytologically ...
Panja M - - 2000
In recent years, the indications for permanent pacemakers have expanded. The interest has focussed on hypertrophic cardiomyopathy, dilated cardiomyopathy and a new entity called hypertensive hypertrophy with cavity obliteration (HHCO). Pacemaker therapy is establishing itself for the prevention of atrial fibrillation. Pacing for neurocardiogenic syncope with newer pacing mode has ...
Birnie D - - 2000
Persistent left superior vena cava with coexisting absent right superior vena cava is rare with less than 150 cases in the literature. Various techniques for pacemaker implantation have been described in this situation. We report a 40-year-old man with sinus and atrioventricular nodal dysfunction who underwent dual chamber pacemaker implantation. ...
Batur M K - - 2000
Transvenous placement of a right ventricular pacemaker lead through the artificial tricuspid valve is a known contraindication, and in this situation, epicardial pacemaker implantation is the procedure of choice. However, permanent pacemaker implantation is a subject for debate when the use of the epicardial route is impossible. This report describes ...
Sanders R H - - 2000
The purpose of this study was to compare the forward two and one half somersault dive in a pike position (105B) performed by females (n=25) and the forward three and one half somersault dive in a pike position (107B) performed by males (n=25) to determine changes required by females to ...
Benchimol D - - 2000
BACKGROUND: The number of patients with pacemakers has been increasing and a large number of them will present with chest pain or symptoms suggesting angina pectoris. Myocardial ischemia and presence of coronary artery disease are difficult to detect and assess by noninvasive methods in patients with a pacemaker; the electrocardiogram ...
Arand M - - 2000
In this study, the three-dimensional stabilizing capabilities of the AO-Internal Fixator (IF) and the new Universal Spine System (USS) were investigated. Both devices were tested without and with the cross-link system (IF, IFC, USS, USSC). To determine biomechanical characteristics, a human thoracolumbar spine instability model with resection of the vertebral ...
Markou T - - 2000
Combined intracellular and extracellular recordings from various parts of the isolated dorsal vessel of Tenebrio molitor revealed some of the following electrophysiological properties of the heart and the aorta. (i) The wave of depolarization causing forward pulsation of the dorsal vessel was always transmitted from posterior to anterior, with a ...
Steinberg S D - - 2000
Early dislodgment or malfunction of pacemaker leads can result in significant morbidity and therefore must be corrected promptly. We describe a method of changing pacemaker leads that is atraumatic, maintains central venous access, and eliminates the need for venipuncture. Our technique is simple, highly reproducible, and can be performed with ...
Duru F - - 2000
Continuous monitoring of pacemaker stimulation thresholds and automatic adjustment of pacemaker outputs were among the longstanding goals of the pacing community. The first clinically successful implementation of threshold tracking pacing was the Autocapture feature which has accomplished automatic ventricular capture verification for every single stimulus by monitoring the Evoked Response ...
Chou T M - - 2000
A patient who had undergone bypass surgery 5 yr earlier, including left internal mammary artery (LIMA) grafting to the left anterior descending artery, underwent transvenous dual-chamber permanent pacemaker implantation for persistent advanced atrioventricular block. Intraoperative LIMA graft obstruction occurred, resulting in anterior myocardial infarction that was treated successfully by primary ...
Habicht J M - - 2000
BACKGROUND AND AIM OF THE STUDY: The study aim was to determine the incidence and clinical significance of late cardiac conduction defects (CD) after aortic valve replacement (AVR). METHODS: An analysis was made of 100 consecutive cases after AVR in a prospective outpatient evaluation program. RESULTS: The perioperative (30-day) mortality ...
Barold S S - - 2000
The consequences of a short 160 ms postventricular atrial refractory period (PVARP) were studied in 27 patients with Medtronic Elite series of pacemakers (programmed to the unipolar mode) by using chest wall stimulation and myopotential interference. Because the ventricular refractory period is nonprogrammable at 230 ms, appropriately timed signals produced ...
Sarko J A - - 2000
The emergency physician may be called on at any time to evaluate a patient with a pacemaker. Although current models are very reliable, malfunctions occur. This review discusses the basic components of the antibradycardic pacemaker, which malfunctions can be expected to occur, and how to evaluate an improperly functioning unit. ...
Ayestaran C - - 2000
We report a case of a patient with a history of heart conduction disease, symptom-free and without treatment in the last years, who experienced a severe cardiac complication associated with in vitro fertilization (IVF) with vaginal oocyte retrieval (VOR). Eighty-five minutes after the VOR a severe bradycardia and bradypnea occurred, ...
Buys E M - - 2000
AIM: In patients with and without a permanent pacemaker His bundle ablation was performed for symptomatic drug-refractory atrial fibrillation. This study was performed to examine the complications of temporary pacing in patients without an already implanted pacemaker. METHODS AND RESULTS: Between January 1996 and December 1998, 152 consecutive patients, both ...
Sliz N B NB - - 2000
Pacemakers have been implanted in pediatric patients since the late 1960s. Indications for cardiac pacing in infants and children have evolved to include controlling symptoms as well as providing a life-sustaining cardiac rhythm. Pacemakers have become smaller and able to perform more complex functions. Current pacemakers offer a variety of ...
Basker M R - - 2000
Oesophageal syncope is loss of consciousness on swallowing, which is thought to be associated with an abnormal vagovagal reflex that leads to transient bradycardia. Patients with this potentially lethal condition may present to neurologists, cardiologists or gastroenterologists. It may be associated with cardio-active drug therapy, previous myocardial infarction, or with ...
Hasebe S - - 2000
To try to solve the pathogenesis of severe attic retraction viewed from mastoid condition, we examined the residual soft tissue density (RSTD) in the mastoid by computed tomography (CT) in 85 patients (107 ears) with otitis media with effusion (OME) 3 months after tympanostomy tube insertion or later. The incidence ...
Hayakawa I - - 2000
PURPOSE: The purpose of this study was to examine changes in the masticatory function of complete denture wearers after relining the mandibular denture with a soft liner. MATERIALS AND METHODS: Conventional complete dentures were fabricated for 6 completely edentulous patients. One month after completing adjustments of the dentures, maximum biting ...
Hokkanen J E - - 2000
A simple relationship between the burst length of the trigger neurons of the Crustacea cardiac ganglion and the length of the heartbeat, is shown to lead to chaotic heart rate. Interestingly, the same type of relationship is also capable of generating complex periodic deviations from steady heart rhythm. Real Crustacea ...
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